Alcohols and phenols are formed when a hydrogen atom in hydrocarbon, aliphatic and aromatic respectively, is replaced by hydroxyl group (-OR group). Question 59: Answer: Question 31: Answer: (d) Benzol, 11. Write the equations involved in the following reactions: For students who are looking to giver their best performance for the coming up board exams, it is crucial that students study and revise with the help of important questions. (iii) Refer Ans. Answer: Question 24: Give the IUPAC name of the following compound: (a) FeCl3 (i) Due to -I and -R effect of N03, p-nitrophenoxide ion is more stable than p-methyl phenoxide ions ( + 1 and +R effect of—CH3 group) We have provided Alcohols, Phenols and Ethers Class 12 Chemistry MCQs Questions with Answers to help students understand the concept very well. of iodoform, whereas 1-propanol will not give yellow ppt. (b) Name the reagent used in the oxidation of ethanol to ethanoic acid. Answer: MCQ Questions for Class 12 Chemistry with Answers, Visualising Solid Shapes Class 7 Notes Maths Chapter 15, Exponents and Powers Class 7 Notes Maths Chapter 13, Algebraic Expressions Class 7 Notes Maths Chapter 12, Perimeter and Area Class 7 Notes Maths Chapter 11, NCERT Solutions for Class 10 Social Science Free PDF | Download All Chapters Class 10 NCERT SST Textbook Solutions, NCERT Solutions for Class 10 Maths PDF Download | Free Chapter-wise NCERT Maths Solutions, NCERT Solutions for Class 10 Science Free PDF Download | Chapter Wise NCERT Science Solutions for Grade 10, Rational Numbers Class 7 Notes Maths Chapter 9, Concise Mathematics Class 10 ICSE Solutions. (b) Acidified KMn04 is used in oxidation of ethanol to ethanoic acid. (i) Phenol to benzoquinone These questions are the most important questions usually repeated in almost every year in one form or other. Sample Paper all are made available through the best app for CBSE students and myCBSEguide website. How would you convert the following: Question 62: Answer: Classify the following as primary, secondary and tertiary alcohols. Answer: Question 65: Practicing such most important questions certainly help students to get good marks in exams. Free download Alcohols Phenols and Ethers Class 12 Important Questions Solutions.Ribblu launches platform for supplying free download of CBSE Sample board exam papers & worksheets from nursery to class … Answer: Question 38: padding: 5px;
Name the reagents used in the following reactions: CBSE Class 10 Social Science Marking Scheme 2021 - Download in PDF with Sample Question Paper, OSSC Document Verification Date 2020 Released for Librarian/Assistant Librarian Posts @ossc.gov.in, Check Details Here, Centre for Stem Cell Research (CSCR) Recruitment 2020: Apply Online for Scientist-E and Fellow-E Posts, India Post Jharkhand Recruitment 2020: Apply Online for 1118 GDS, MTS, Postman & Other Posts. CBSE Class 10 Board Exam 2021 - Sample Question Papers and Marking Schemes of All Subjects Released - Download Now! Answer: Question 25: The solved question papers from chapter 11 Alcohols Phenols and Ethers have all type of questions may be asked in annual exams such as VSA very short answer type questions, SA short answer type questions, LA long answer type questions, VBA value based questions and HOTS higher order thinking skill based questions. Question 30: (c) 2, 4, 6-Tribromophenol o-nitrophenol is more volatile. Answer: Question 17: (c) The reaction of propanone with methylmagnesium bromide followed by hydrolysis. (iii) It is because (CH3)3C+ (Tert. It is because alkoxides are not only nucleophiles but strong bases as well. Answer: carbocation is more stable which combines with 1“ to form Tert. (iii) Tert. (iii) It is because —N02 group is electron withdrawing (- R effect), it increases the stability of o- and p-nitrophenoxide ion (phenolate ion) as compared to phenoxide ion. In addition to this, O-nitrophenoxide ion is stabilized by resonance, 1 thereby making O-nitrophenol a stronger acid. (iii) Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method. .btn {
The solved question papers from chapter 11 Alcohols Phenols and Ethers have all type of questions … The topic Alcohols, Phenols and Ethers is the 11th chapter in the class 12th CBSE syllabus. 1.1.1 2015; 1.1.2 Very Short Answer Type Questions [1 Mark] 1.1.3 Short Answer Type Questions [II] [3 Marks] 1.1.4 Long Answer Type Questions [5 Marks] 1.1.5 2014; 1.1.6 Very Short Answer Type Questions [1 Mark] (ii) Orf/ro-nitrophenol is more acidic than ort/io-methoxyphenol. (ii) It is because ethanol is associated with intermolecular H-bonding, whereas methoxymethane is not. (ii) Refer Ans. (d) I > III > II, 4. Draw the structure and name the product formed if the following alcohols are oxidized. How will you convert: (d) Cinnamic acid, 7. Ethers containing substituted alkyl groups (secondary or tertiary) may also be prepared by this method. The reaction involves the SN2 attack of an alkoxide ion on primary alkyl halide. Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers with Answers Pdf free download. (a) Oxidation with KMnO4 followed by reaction with Fehling solution. Answer: Draw the structural formula of 2-methylpropan-2-ol molecule (ii) Phenol does not give protonation reaction readily. to Q.29. (a) Picric acid (ii) Friedel-Crafts reaction. (i) O-nitrophenol is more acidic than O-methoxyphenol. Question 6: Register online for Chemistry tuition on Vedantu.com to score more marks in CBSE board examination. Ethers containing substituted alkyl groups (secondary or tertiary) may also be prepared by this method. (ii) Ortho-nitrophenol is more acidic than ortho-methoxyphenol. (iv) Friedel-Crafts reaction: Anisole undergoes Friedel-Crafts reaction, i.e., the alkyl and acyl groups are introduced at ortho and para positions by reaction with an alkyl halide and acyl halide in the presence of anhydrous aluminium chloride (a Lewis acid) as a catalyst. acid dehydration of ethanol to yield ethene. State the products of the following reactions: Write the IUPAC name of the given compound: Answer: text-transform: none;
(d) Darzen’s reaction. Also Access CBSE Class 12 chemistry Sample Papers and class 12 Chemistry previous year question papers. (i) Ethanol and phenol (iii) Acid catalysed hydration of an alkene forming an alcohol. These questions are repeatedly asked in exams in one or other way round. Arrange the following compounds in the increasing order of their acid strengths: Also, phenoxide ion exists in resonance structure. (iii) Friedel – Crafts alkylation of anisoie 12th Chemistry chapter 11 Alcohols Phenols and Ethers have many topics. Give reasons for the following: (i) Addition of Grignard’s reagent to the carbonyl group of a compound forming an adduct followed by hydrolysis. Answer: (ii) It is due to +ve charge on 3 out of 5 resonating structures of phenol. Practicing such most important questions certainly help students to get good marks in exams. Question 18: (i) Nitration of phenol to 2, 4, 6-trinitrophenol (ii) Butanal to Butanol . (iv) Phenol is more acidic than ethanol because on losing H. ion forms ethoxide ion. (iii) (CH3)3C—O—CHS on reaction with HI gives (CH3)3C—I and,CH3—OH as the main products and not (CH3)3C—OH and CH3—I (ii) Dehydration of ethanol, giving ethene. Classification of Alcohols and Phenols. (i) Refer Ans. to Q.25 (iii). The boiling point of ethanol is higher than that of methoxymethane because of the presence of intermolecular H-bonding, associated molecules are formed, hence ethanol has a high boiling point while methoxymethane does not have intermolecular H-bonding. Alcohol is more soluble in water than the hydrocarbons of comparable molecular masses. (a) I > II > III These questions are repeatedly asked in exams in one or other way round. Give reasons for the following: (iv) Oxidation of primary alcohol to carboxylic acid. padding: 5px;
(c) II > III > I (b) O-Bromophenol (iii) It is because phenoxide ion is stabilized by resonance, whereas methoxide ion is not. (ii) 2-methylpropan-2-ol from methyl magnesium bromide Alcohol can form H-bonds with water and break the existing H-bonds between water molecules whereas hydrocarbons cannot form H-bonds with water. (i) Aniline to phenol Example, the reaction of CH3ONa with (CH3)3C–Br gives exclusively 2-methylpropene. (ii) It is because — N02 group is electron withdrawing and —OCH3 group is electron releasing. CBSE sure shot questions for exams are here. If a tertiary alkyl halide is used, an alkene is the only reaction product and no ether is formed. CBSE Previous Year Question Papers Class 10, CBSE Previous Year Question Papers Class 12, NCERT Solutions Class 11 Business Studies, NCERT Solutions Class 12 Business Studies, NCERT Solutions Class 12 Accountancy Part 1, NCERT Solutions Class 12 Accountancy Part 2, NCERT Solutions For Class 6 Social Science, NCERT Solutions for Class 7 Social Science, NCERT Solutions for Class 8 Social Science, NCERT Solutions For Class 9 Social Science, NCERT Solutions For Class 9 Maths Chapter 1, NCERT Solutions For Class 9 Maths Chapter 2, NCERT Solutions For Class 9 Maths Chapter 3, NCERT Solutions For Class 9 Maths Chapter 4, NCERT Solutions For Class 9 Maths Chapter 5, NCERT Solutions For Class 9 Maths Chapter 6, NCERT Solutions For Class 9 Maths Chapter 7, NCERT Solutions For Class 9 Maths Chapter 8, NCERT Solutions For Class 9 Maths Chapter 9, NCERT Solutions For Class 9 Maths Chapter 10, NCERT Solutions For Class 9 Maths Chapter 11, NCERT Solutions For Class 9 Maths Chapter 12, NCERT Solutions For Class 9 Maths Chapter 13, NCERT Solutions For Class 9 Maths Chapter 14, NCERT Solutions For Class 9 Maths Chapter 15, NCERT Solutions for Class 9 Science Chapter 1, NCERT Solutions for Class 9 Science Chapter 2, NCERT Solutions for Class 9 Science Chapter 3, NCERT Solutions for Class 9 Science Chapter 4, NCERT Solutions for Class 9 Science Chapter 5, NCERT Solutions for Class 9 Science Chapter 6, NCERT Solutions for Class 9 Science Chapter 7, NCERT Solutions for Class 9 Science Chapter 8, NCERT Solutions for Class 9 Science Chapter 9, NCERT Solutions for Class 9 Science Chapter 10, NCERT Solutions for Class 9 Science Chapter 12, NCERT Solutions for Class 9 Science Chapter 11, NCERT Solutions for Class 9 Science Chapter 13, NCERT Solutions for Class 9 Science Chapter 14, NCERT Solutions for Class 9 Science Chapter 15, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 10 Maths Chapter 1, NCERT Solutions for Class 10 Maths Chapter 2, NCERT Solutions for Class 10 Maths Chapter 3, NCERT Solutions for Class 10 Maths Chapter 4, NCERT Solutions for Class 10 Maths Chapter 5, NCERT Solutions for Class 10 Maths Chapter 6, NCERT Solutions for Class 10 Maths Chapter 7, NCERT Solutions for Class 10 Maths Chapter 8, NCERT Solutions for Class 10 Maths Chapter 9, NCERT Solutions for Class 10 Maths Chapter 10, NCERT Solutions for Class 10 Maths Chapter 11, NCERT Solutions for Class 10 Maths Chapter 12, NCERT Solutions for Class 10 Maths Chapter 13, NCERT Solutions for Class 10 Maths Chapter 14, NCERT Solutions for Class 10 Maths Chapter 15, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, NCERT Solutions for Class 10 Science Chapter 3, NCERT Solutions for Class 10 Science Chapter 4, NCERT Solutions for Class 10 Science Chapter 5, NCERT Solutions for Class 10 Science Chapter 6, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, Important Questions For Class 11 Chemistry, Important Questions For Class 12 Chemistry, class 12 Chemistry previous year question papers, CBSE Previous Year Question Papers Class 10 Science, CBSE Previous Year Question Papers Class 12 Physics, CBSE Previous Year Question Papers Class 12 Chemistry, CBSE Previous Year Question Papers Class 12 Biology, ICSE Previous Year Question Papers Class 10 Physics, ICSE Previous Year Question Papers Class 10 Chemistry, ICSE Previous Year Question Papers Class 10 Maths, ISC Previous Year Question Papers Class 12 Physics, ISC Previous Year Question Papers Class 12 Chemistry, ISC Previous Year Question Papers Class 12 Biology.
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